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Engineering Materials
0

Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. Tungsten in high speed steel provides

Sharp cutting edge

Wear resistance

Hot hardness

Toughness

2. Gun metal contains

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

70 - 78% copper and rest tin

90% copper and 10% tin

3. Free cutting steels

Do not exist

Are used where ease in machining is the criterion

Require least cutting force

Contain carbon in free form

4. Preheating is essential in welding

All nonferrous materials

High speed steel

Cast iron

All of the above

5. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Manganese

Chromium

Nickel

6. Steel made from phosphate iron is

Brittle

Hard

Tough

Ductile

7. The hardness of steel increases if it contains

Martensite

Pearlite

Cementite

Austenite

8. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.1 to 0.2%

0.25 to 0.5%

0.6 to 0.7%

9. Nimonic contains __________ percentage of nickel as that of Inconel.

Same

Less

More

None of these

10. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron

Copper, nickel and antimony

Iron, zinc and bismuth

Nickel, copper and zinc

Page 2 of 4

11. Melting point of iron is

1489°C

1712°C

1601°C

1539°C

12. Manganese in steel increases its

Fluidity

Ductility

Tensile strength

Hardness

13. The crystal structure of brass is

B.C.C.

F.C.C.

H.C.P.

Orthorhombic crystalline structure

14. Connecting rod is usually made of

Medium carbon steel

Aluminium

High carbon steel

Low carbon steel

15. Which is false statement about tempering? Tempering is done to

Release stresses

Improve toughness

Improve ductility

Improve machinability

16. Bronze contains

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

90% copper and 10% tin

70 - 75% copper and rest tin

17. Chromium in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

18. Argentite is the principal ore or raw material for

Silver

Zinc

Tin

Aluminium

19. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

1015

710

35

20. Cupola produces following material

Pig iron

Cast iron

Malleable iron

Wrought iron

Page 3 of 4

21. Permalloy is a

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

None ferrous alloy

22. Phosphor bronze contains

None of the above

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

23. Sulphur in cast iron

Make the iron white and hard

Makes the iron soft and easily machinable

Increases hardness and brittleness

Aids fusibility and fluidity

24. Cold rolled steel sheets contain carbon of the following order

0.6%

0.4%

0.1%

0.2%

25. Hardness of upper bainite (acicular structure) is about

RC 57

RC 48

RC 65

RC 80

26. The presence of sulphur in pig iron makes

It brittle

It hard

It easily machinable

The casting unsound

27. An example of amorphous material is

Glass

Silver

Lead

Zinc

28. Carbon in iron is an example of

Intermetallic compounds

All of the above

Substitutional solution

Interstitial solid solution

29. The alloy used for making electrical resistances and heating elements is

Nichrome

Magnin

Invar

Elinvar

30. Which of the following is used for bearing liner?

Bronze

Gun metal

Babbitt metal

Bell metal

Page 4 of 4

31. Delta metal is an alloy of

Iron, nickel and copper

Copper, zinc and iron

Iron, lead and tin

Iron, aluminium and magnesium

32. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

Phosphorous and aluminium

Silicon and sulphur

33. Beryllium bronze has

(A) High yield point

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

34. Shock resisting steels should have

Low tensile strength

Low wear resistance

Low hardness

Toughness

35. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Nickel and molybdenum

Chromium and nickel

Tungsten and sulphur

36. Aluminium bronze contains aluminium and copper in the ratio of

40 : 60

60 : 40

50 : 50

10 : 90

37. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Mild steel

Stainless steel

38. Which of the following is the binding material in cemented carbides?

Iron

Nickel

Cobalt

Vanadium

39. The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets

Can be drawn into wires

Can cut another metal

Breaks with little permanent distortion

40. High carbon steel carries carbon percentage

0.3 to 0.6%

0.6 to 0.8%

0.8 to 1.5%

0.1 to 0.3%

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VideRime

A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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